A Biomass Pyrolysis-Hydrothermal Methanation Cogeneration Process and Its Device with Interseasonal Energy Storage Function

Abstract

The invention discloses a biomass pyrolysis-hydrothermal methanation poly-cogeneration process and its device with the function of inter-seasonal energy storage, including solid biomass fast pyrolysis and product separation unit, hydrothermal methanation unit, CO 2 Separation and pressure energy recovery unit, oil and gas energy storage unit, biochar modification unit, waste heat recovery and utilization unit. After the biomass is broken and dried, it undergoes rapid pyrolysis and product separation to obtain gas-solid-liquid three-phase products. The main product pyrolysis oil is pressurized and enters the hydrothermal methanation reactor to generate CH 2 and CO 2 Crude natural gas as the main component, and then remove CO after pressure regulation 2 , to obtain CH with high concentration 4 The SNG. Pyrolysis gas phase products, combined with part of SNG to provide heat for rapid pyrolysis and biochar modification. The solid phase products of pyrolysis are modified using physical methods. The invention has compact process, flexible operation mode, better energy storage capacity, and is suitable for comprehensive utilization of resources such as urban and rural agricultural and forestry wastes and household garbage.

Description

technical field [0001] The invention provides a method for producing synthetic natural gas and producing heat, electricity and biochar through biomass pyrolysis-hydrothermal methanation with energy storage function, and belongs to the technical field of biogas production and biomass comprehensive utilization. Background technique [0002] my country's natural gas resources are scarce, but the demand is increasing year by year, resulting in the current situation of large supply and demand contradictions, large dependence on foreign countries, large differences between peak and valley consumption in winter and summer, and large differences in urban and rural usage. The vast rural and township areas urgently need clean gas to improve the smoky dilemma in cooking and heating in winter. [0003] Biomass is a renewable resource with huge resources and wide distribution. Replacing fossil fuels with synthetic fuels from biomass gasification is one of the important ways to promote e...

AI Technical Summary

Problems solved by technology

The process has the following disadvantages: many process steps; the steam gasification reactor generally uses a double fluidized bed, which is difficult to design and operate; many parts of the process need to use fans or compressors, and the energy consumption is high; the product is single; Logistics is gaseous, and it is normal pressure and low pressure, so the equipment volume and floor area are large; the process is long and the potential failure rate is high

In traditional biomass storage and storage, due to the small bulk density of biomass raw materials, the required storage volume is huge, and the transportation of a large amount of solids requires a complete set of transportation facilities, which occupies a large area and has a high failure rate

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